James House is planning on starting a cleaning services business but has not decided whether he should focus on residential clients or commercial clients. His estimates of revenue, variable expenses, and fixed expenses are shown below. Revenue Variable expense Fixed expense Residential $ 70 per hour $ 42 per hour $ 5,600 per month Commercial $ 80 per hour $ 40 per hour $ 6,560 per month Required: 1. At what volume of hours per month will James be indifferent between focusing on residential versus commercial clients? Number of hours 80 The break-even in units sold will decrease if there is an increase in which of the following